Blackberry Farm’s Sweet and Spicy Foothills Coleslaw

INGREDIENTS

• 3 Tbs. Dijon mustard
• 1/4 cup firmly packed light brown sugar
• 3 Tbs. malt vinegar
• 1 1/2 tsp. mustard seed oil or very spicy mustard such as English or German
• 1 1/2 tsp. kosher salt, plus more, to taste
• 1/4 tsp. freshly ground pepper, plus more, to taste
• 1 cup mayonnaise
• 3 cups thinly sliced red cabbage
• 3 cups thinly sliced green cabbage
• 1 1/2 cups shredded carrots
• 3/4 cup shredded red onion